Is it ok to ask out a girl on facebook at age 25?

[Crimson Knight]

I was just wondering is it ok for someone who is 25 to ask someone out on facebook? I used to work with this girl on facebook and I want to ask her out since she's been single for awhile. I have no other way of asking her out except for facebook but it just sounds like the wussy way. I know nowadays it's acceptable in the 15-20 year old range but at my age idk if it is. I might just ask if she wants to hang out and hang out with her a few times and then ask her out but that way doesn't always work either.
You people are missing the point of me using facebook! I have no other way of asking her out! I do not have her phone number or any mutual friends to set us up!